Object Location Sensor of Touch Panel

Abstract

An object location sensor of a touch panel has at least one capacitive sensing set having two adjacent capacitive sensors. The at least one capacitive sensing set is arranged along a direction, one capacitive sensor has a capacitance value increasing gradually along the direction, and another capacitive sensor has a capacitance value decreasing gradually along the direction.

1 . An object location sensor of a touch panel, comprising:
 at least one capacitive sensing set having adjacent first and second capacitive sensors, the at least one capacitive sensing set arranged along a direction, the first capacitive sensor having a capacitance value increasing gradually along the direction, and the second capacitive sensor having a capacitance value decreasing gradually along the direction.   
   
   
       2 . The object location sensor as claimed in  claim 1 , wherein the first capacitive sensor has a capacitance value CXodd when the first capacitive sensor is touched by an object, the second capacitive sensor has a capacitance value CXeven when the second capacitive sensor is touched by the object, and the at least one capacitive sensing set has a total capacitance value Ctot when it is touched by the object, the total capacitance value Ctot is equal to a sum of the capacitance value CXeven and the capacitance value CXodd. 
   
   
       3 . The object location sensor as claimed in  claim 2 , wherein when the object location sensor is scanned to detect one capacitive sensing set having the total capacitance value Ctot, the capacitive sensing set is a first dimensional location touched by the object; a ratio, selected from a group consisted of (CXeven-CXodd)/Ctot, CXeven/Ctot and CXodd/Ctot, is used to determine a second dimensional location touched by the object. 
   
   
       4 . The object location sensor as claimed in  claim 1 , wherein the first capacitive sensor has a plurality of strip capacitive branches increasing gradually along the direction to increase the capacitive value thereof, and the second capacitive sensor has a plurality of strip capacitive branches decreasing gradually along the direction to decrease the capacitive value thereof. 
   
   
       5 . The object location sensor as claimed in  claim 1 , wherein the first capacitive sensor has a plurality of triangular capacitive branches increasing gradually along the direction to increase the capacitive value thereof, and the second capacitive sensor has a plurality of triangular capacitive branches decreasing gradually along the direction to decrease the capacitive value thereof. 
   
   
       6 . The object location sensor as claimed in  claim 1 , wherein the first capacitive sensor has a plurality of rectangular capacitive branches increasing gradually along the direction to increase the capacitive value thereof, and the second capacitive sensor has a plurality of rectangular capacitive branches decreasing gradually along the direction to decrease the capacitive value thereof. 
   
   
       7 . The object location sensor as claimed in  claim 1 , wherein the first capacitive sensor has a plurality of annular capacitive branches increasing gradually along the direction to increase the capacitive value thereof, and the second capacitive sensor has a plurality of annular capacitive branches decreasing gradually along the direction to decrease the capacitive value thereof.